Underground excavation construction deformation control method for three-hole small clear distance tunnel underpass trunk railway

Abstract

The invention discloses an underground excavation construction deformation control method for a three-hole small clear distance tunnel underpass trunk railway, and belongs to the technical field of tunnel (hole) shallow buried soil stratum construction. Firstly, construction surface subsidence control standards are determined according to the requirement of an existing trunk railway for track smoothness; secondly, construction schemes and construction parameters of the three-hole tunnel are tested and determined by the aid of three-dimensional finite element static and dynamic numerical values. Construction includes the steps: reinforcing lines; grouting and reinforcing the earth surface; constructing an advanced tube screen; constructing a tunnel portal; constructing a tunnel crevasse; grouting and reinforcing side walls and tunnel faces; excavating the tunnel; supporting the tunnel; forming a secondary liner of the tunnel; recovering the lines, and monitoring measurement is performed in the whole construction process. Construction quality is strictly controlled according to a predetermined scheme and process in the construction process, the construction parameters are timely fed back and adjusted by the aid of an information construction technology, and operation safety of existing lines and structural stability of the tunnel are guaranteed.

Description

technical field

[0001] The invention relates to the technical field of tunnel (cave) shallow-buried soil stratum construction, in particular to a method for controlling the deformation of underground excavation construction of a three-hole small-space tunnel passing under a railway trunk line. Background technique

[0002] With the development of infrastructure construction, the interaction between various projects and indirect construction is becoming more and more serious. It is inevitable for the water main canal to cross the existing railway, and it is a new topic to ensure the construction safety and railway operation safety during the passage of the tunnel.

[0003] When the construction tunnel passes under the railway, it will inevitably have adverse effects on the main railway line, such as uplift and settlement. In order to ensure the safety of tunnel construction and railway traffic, the measures taken in the existing construction methods include: strictly control...

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